refactor IPC (#341)

tests/unit/feedback-state.test.tsx

@@ -0,0 +1,30 @@
+import { describe, it, expect } from 'vitest';
+import { render, screen } from '@testing-library/react';
+import { FeedbackState } from '@/components/common/FeedbackState';
+
+describe('FeedbackState', () => {
+  it('renders loading state content', () => {
+    render(<FeedbackState state="loading" title="Loading data" description="Please wait" />);
+
+    expect(screen.getByText('Loading data')).toBeInTheDocument();
+    expect(screen.getByText('Please wait')).toBeInTheDocument();
+  });
+
+  it('renders action for empty state', () => {
+    render(
+      <FeedbackState
+        state="empty"
+        title="Nothing here"
+        action={<button type="button">Create one</button>}
+      />,
+    );
+
+    expect(screen.getByRole('button', { name: 'Create one' })).toBeInTheDocument();
+  });
+
+  it('renders error state title', () => {
+    render(<FeedbackState state="error" title="Request failed" />);
+
+    expect(screen.getByText('Request failed')).toBeInTheDocument();
+  });
+});